i recently installed a dc 4-2-1 header on my car along with a straight pipe and a muffler now it sounds like crap at 3000-3500 rpm after 3600 rpm it sounds normal agian. its embarassing...any suggestions?

 

Is something vibrating, like a heatshield?

FB

 

How about the gasket between the header and pipe???

no gasket will cause vibrations at 3000 rpm.

 

Are you sure you bolted everythang on tight and gaskets are in??? What problem is it vibrations or slight rattlin?

 

im pretty sure everythings bolted on tight...i think its the heatshield under the car or is it maybe because im running without a catalyst? just a straight pipe?

 

Heatshield.

 

its not the heatshield like nerdish said. im pretty sure its the gasket between the header and the catalytic, however you spell it. yea what stephen could be the problem. my friend has that exact header and when i installed it, i forgot to put in the gasket and it makes rattling noises at certin rpm's jus like you. nothing really big nothing big to worry about jus a missing gasket.

 

Quote:

its not the heatshield like nerdish said. im pretty sure its the gasket between the header and the catalytic, however you spell it. yea what stephen could be the problem. my friend has that exact header and when i installed it, i forgot to put in the gasket and it makes rattling noises at certin rpm's jus like you. nothing really big nothing big to worry about jus a missing gasket.

Nothing big to worry about w/o gasket? hehe lol. no gasket you can have exhaust leak oil leak etc and nasty sounds so make sure u got the gaskets in. Good luck.

 

i say gasket

 

Honda's don't really sound that good with test pipe's, really rattley.
EVIL